Report of Investigations 9003: Large-Scale Laboratory Drag Cutter Experiments in Hard Rock

Details

• Journal Article:
  MISSING
• Personal Author:
  Larson, David A. ; Morrell, Roger J. ; Swanson, David E.
• Description:
  The Bureau of Mines conducted a series of laboratory experiments to test a cutting technique for hard rock using large-scale drag cutters. Cutting experiments were performed on rocks ranging in compressive strength from 10,000 to 27,000 lb/in2, using large drag cutters from 3 to 6 in. In width. The tests were conducted on a special test apparatus, called a ripper tester, which made a curvilinear cut across the rock sample while measuring the cutting force acting on the drag cutter. The cutting method that evolved from these experiments is called ripper cutting, and its energy efficiency appears superior to all other large-scale mechanical fragmentation techniques. In addition, the method created very little dust, and the wear on the bits was negligible. A fragmentation system based on ripper cutting was then devised, and a large-scale test device was fabricated to allow full-scale laboratory testing of the system. The results of these tests will be published in future Bureau reports. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety
• Source:
  MISSING :18 pages
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  United States
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  TCRC - Twin Cities Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  23 pdf pages
• NIOSHTIC Number:
  nn:10004942
• Federal Fiscal Year:
  1986
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9d7216ffa57c90bda01f2ce554675ab54aa314d6abf262eb0ceda634d1679b2443a2b4086b49b85956a9b6ec4b6e6305429482826236e807336041644e356a6d
• Download URL:
  https://stacks.cdc.gov/view/cdc/10567/cdc_10567_DS1.pdf
• File Type:
  [PDF - 8.31 MB ]